Cake The first computer virus appeared short after the advent of the first IBM PC and was relatively harmless and they spread via infected floppy disks as this was prior to the Internet and infections via email.

What would you ask from the creators of the very first PC virus?

QUOTE: It’s now January 2011. Which means the Brain virus is now 25 years old. Brain, spreading on 5.25″ floppy disks was the first PC virus. Which means that the PC virus is now 25 years old.

F-Secure — Brain Virus Decription

QUOTE: Virus:Boot/Brain is possibly the oldest virus known on the DOS platform, as it first detected in January ’86. Several variants of this virus are known, but most of them are fairly harmless. One harmful variant has been reported, which was designed to attack on May 5. 1992.  This virus is rather large and most of it is located in sectors that are marked as “bad” in the FAT. One of the most interesting details regarding the Brain virus is the following text, which appears inside it: 

  •  Welcome to the Dungeon
   (c) 1986 Basit & Amjad (pvt) Ltd.
   PHONE :430791,443248,280530.
   Beware of this VIRUS….
   Contact us for vaccination…